#app {

    .box {
        width: 3rem;
        height: 1.5rem;
        border: 1px solid black;
        position: relative;
        margin: .3rem auto;

        .pic {
            width: 100%;
            height: 100%;
        }

        .left,
        .right {
            position: absolute;
            background-color: #fff;
            width: .3rem;
            height: .5rem;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            text-align: center;
            line-height: .5rem;
            cursor: pointer;

            &:hover {
                background-color: #ddd;
            }
        }

        .right {
            left: auto;
            right: 0;
        }
    }
}